首页|Achieving High-Performance Molecular Rectification through Fast Screening Alkanethiol Carboxylate-Metal Complexes Electroactive Units
Achieving High-Performance Molecular Rectification through Fast Screening Alkanethiol Carboxylate-Metal Complexes Electroactive Units
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Achieving high performance in molecular scale diode devices remains a formidable challenge due to the complexity of the charge transport process and the difficulty in device structure modulation.Herein,we demonstrated a low-cost and fast screening strategy to search for proper electroactive units and construct high performance self-assembled monolayer(SAM)-based molecular diodes.The strategy is based on off-the-shelf carboxylate-terminated alkane thiols and simple carboxylate-metal ion complexes,struc-tures denoted as Au-S-(CH2)n-1COO-Mm+(Cn+Mm+),where n=11,12,13,14,16,18,and Mm+=Ca2+,Mn2+,Fe2+,Fe3+,Co2+,Ni2+,Cu2+,and Zn2+,as the library of functional SAM layers on gold substrate.Combing the fast screening measurements using a eutectic indium-gallium alloy top contact(EGain),C18+Ca2+and C18+Zn2+structures were found to afford record high rectification ratio(RR)＞700 at±1.5 V.Theoreti-cal analysis based on a single level tunneling model shows that the C18+Ca2+and C18+Zn2+devices possessed an optimized combination of asymmetric voltage division,energy offset,and coupling of car-boxylate-metal complexes with the electrode.This newly developed method represents a general strat-egy for fast,inexpensive,and effective exploration of the functional metal complex chemical space,and can largely accelerate the development of practical high performance molecular diode devices.
Tianjin Key Laboratory of Molecular Optoelectronic Science,School of Science,Tianjin University,Tianjin 300072
国家自然科学基金国家自然科学基金国家重点研发计划国家重点研发计划PEIYANG Young Scholars Program of Tianjin UniversityIndustry-University-Research Cooperation Program of Tianjin University and Qinghai Nationalities University
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